MOLD!!! we set out Christmas tree on a piece of plywood on the carpet. At some point the stand wsa overfilled and wet the plywood, which nolded and seeped thru to the top of the carpet and left a dusty blue mold just on the top. It's drying right now. Can this just be vaccuumed up, or sprayed with some mold killer other than bleach so it won't discolor the carpet? HELP!!!!!